Is it normal to constantly imagine yourself with a girl?
About a month ago I met this girl whilst traveling we're from different countries and I kind of fell for her but totally blew it in the end. Even though we hit it off pretty well I got drunk and tried to kiss her, I know what a cliche, which led to her breaking off communication once she left and politely texting me that she has a boyfriend. So I messed it up with a girl and got rejected big deal but I literally cannot stop thinking about her. I know it's normal to fantasize about someone you are sexually attracted to but I think I'm taking it so far that it's becoming unhealthy. Not only do I fantasize about sex with her or how I could have done things differently I picture a detailed relationship with her. I'm so obsessed I even imagine myself as someone who I'd want to be like, someone she would be attracted to. Like the way the narrator of Fight Club does, and it sucks to come back to reality knowing that I can never be that.
I'm 20 with limited experience with girls and I know that I'm in love with the idea of her and that I haven't experienced what it's like to really have a girlfriend. It makes no logical sense to keep doing this but every morning in bed I just lay there fantasizing about her next to me.
I've actually done this before to crushes but never to someone I actually interacted with to the point of being a friend. Is this normal or really unhealthy?